my cam is detected on fedora core 2 and configure but when i say
xawtv it shows errors

This is xawtv-3.93, running on Linux/i686 (2.6.5-1.358)
can't open /dev/video0: No such device or address
v4l-conf had some trouble, trying to continue anyway
v4l2: open /dev/video0: No such device or address
v4l2: open /dev/video0: No such device or address
v4l: open /dev/video0: No such device or address
no video grabber device available
please help me out

I don't know if this is still an issue for anyone, but a google search when I was looking for more information to get a Logitech QuickCam 4000 Pro lead me here. :-)

Using Yum (or your favorite package too), you can install kernel 2.6.8-1.521. PWC support was right out of the gate even though there seems to be an issue with XawTV using "normal" sized image capture... It looks like I may be stuck at 120x120 or something close to that. :-(

I will post more info if/when I find it. I hope this helps someone.

P.S. The same thing happens in GnomeMeeting so I imagine it's a V4L limitation or something at a lower rung of the whole setup than than app.